Added images showing colors to documentation

docs/getting-started.md

@@ -123,6 +123,8 @@ _deep purple_, _indigo_, _blue_, _light blue_, _cyan_, _teal_, _green_, _light
 green_, _lime_, _yellow_, _amber_, _orange_, _deep orange_, _brown_, _grey_ and
 _blue grey_. The last three colors can only be used as a primary color.
 
+![Material Screenshot](images/colors.png)
+
 If the color is set via this configuration, an additional CSS file called
 `palettes.css` is included that defines the color palettes. If you want to
 keep things lean, clone the repository and recompile the theme with your